PDCP PDU Duplication Across RLC Channels for 5G NR Reliability
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Solution Overview
Problem
Existing data transmission methods in 5G NR systems face challenges in achieving high reliability and frequency diversity gain, particularly in scenarios requiring continuous wide-area coverage and low latency, such as the Internet of Things and Internet of Vehicles.
Innovation Solution
Implementing a data transmission method that activates the data duplication function of the PDCP layer entity, enabling the first RLC layer entity when necessary, and duplicating PDCP PDUs to be transmitted on two logical channels, thereby enhancing frequency diversity and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data duplication function is activated to transmit on multiple carriers, then reliability and frequency diversity gain are improved, but device complexity and processing overhead increase
Solution Approach 1:
The patent segments the data transmission process by separating PDCP layer duplication from RLC layer transmission. The PDCP layer duplicates PDCP PDUs and indicates duplication to RLC entities, while RLC entities independently handle transmission on different logical channels. This segmentation allows reliability improvement through multiple paths without proportionally increasing overall system complexity.
Solution Approach 2:
The patent applies preliminary action by having the PDCP layer pre-duplicate PDCP PDUs and set duplication indicators before RLC layer transmission. This advance preparation ensures that when data needs to be transmitted reliably, the duplication is already in place, reducing real-time processing complexity during actual transmission.
2Reliability
If data is transmitted on multiple logical channels across different carriers, then frequency diversity gain is achieved, but transmission coordination complexity increases
Solution Approach 1:
The patent divides the transmission task across segmented layers: PDCP layer handles duplication and indicator setting, while RLC entities independently manage their respective logical channels. Each RLC entity receives duplication indication and autonomously transmits on its assigned carrier, eliminating the need for complex cross-channel coordination and reducing overall system complexity.
Solution Approach 2:
Each RLC entity operates autonomously after receiving duplication indication from PDCP layer. The RLC entities self-manage their transmission on different logical channels without requiring continuous coordination with other RLC entities, reducing coordination complexity while maintaining frequency diversity benefits.
Data Source
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AI summary
Disclosed are a data transmission method and a related product. The method comprises: when it is detected that a data replication transmission function of a PDCP layer entity is activated, a terminal enabling a first RLC layer entity, a second RLC layer entity being in an enabled status; and invoking the PDCP layer entity to determine a first PDCP PDU associated with a first PDCP SDU, and sending the first PDCP PDU to the first RLC layer entity, wherein the first PDCP PDU is used for the first RLC layer entity and a MAC layer entity to process the first PDCP PDU into a MAC PDU and send same. The embodiments of the present invention facilitate the realization of a frequency diversity gain and improve the reliability of data transmission.